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A: Fachverband Atomphysik

A 30: Ultracold Atoms I (with Q)

A 30.4: Vortrag

Donnerstag, 9. März 2017, 15:30–15:45, P 104

State-dependent transport of neutral atoms in two dimensions — •Gautam Ramola, Stefan Brakhane, Geol Moon, Max Werninghaus, Carsten Robens, Richard Winkelmann, Alexander Knieps, Wolfgang Alt, Dieter Meschede, and Andrea Alberti — Institut für Angewandte Physik, Bonn, Germany

Discrete time quantum walks (DTQWs) offer a versatile platform for exploring quantum transport phenomena involving the delocalization of pseudo-spin-1/2 particles on a lattice. Our recently built 2D state-dependent optical lattice setup provides an ideal platform to simulate topologically protected edge state transport using DTQWs in two dimensions [1]. The 2D quantum simulator makes use of polarization-synthesized lattice beams to deterministically transport neutral Cs atoms based on their internal state [2]. Furthermore, a high numerical aperture (NA = 0.92) objective lens [3] is used for imaging and addressing atoms with single site resolution, enabling us to create sharp boundaries between different topological domains. I will report on the experimental realization of the polarization synthesized optical lattice in two dimensions and on the most recent results.

[1] T. Groh et al. Robustness of topologically protected edge states in quantum walk experiments with neutral atoms, Phys. Rev. A 94 (2016)

[2] C. Robens et al. Fast, high-precision optical polarization synthesizer for ultracold-atom experiments, arXiv:1611.07952 (2016)

[3] C. Robens et al. A high numerical aperture (NA = 0.92) objective lens for imaging and addressing of cold atoms, arXiv:1611.02159 (2016)